SN74CB3T16212ZQLR

Overview

The SN74CB3T16212ZQLR is a 24-bit FET bus-exchange switch from the Widebus family, manufactured by Texas Instruments. It operates with a supply voltage range of 2.3 V to 3.6 V and features 5-V-tolerant level shifters that track VCC. The device supports mixed-mode signal operation on all data I/O ports, allowing bidirectional data flow between four signal ports controlled by S0, S1, and S2 inputs. It offers low ON-state resistance (typical 5 Ω) and low input/output capacitance (9 pF typical). The component is housed in a 56-pin VFBGA package.

Feature Summary

• Provides voltage translation that tracks VCC for mixed-mode signal operation
• Supports bidirectional data flow between four selectable signal ports
• Features 5-V-tolerant I/Os compatible with powered-up or powered-down devices
• Includes Ioff support to prevent backflow current during partial-power-down mode

Applications

• Level translation in mixed-voltage systems
• PCI interface connections
• USB interface implementations
• Memory interleaving circuits
• Bus isolation applications

Procurement Notes

Verify the specific ordering suffix ZQLR corresponds to the VFBGA package type and tape-and-reel packaging configuration. Confirm RoHS compliance and lead-free status as indicated by the manufacturer's active production data. Ensure design compatibility with the specified operating temperature range and moisture sensitivity level before finalizing procurement specifications.

Selection Notes

Select this component when designing systems requiring 24-bit wide bus switching with configurable port exchange capabilities. It is suitable for applications needing low propagation delay and minimal loading due to low capacitance characteristics. Consider its 5-V tolerance for interfacing between different logic families without additional level shifting components.

Part Context

This part belongs to the SN74CB3T series of high-speed TTL-compatible FET bus switches. It is part of Texas Instruments' Widebus family, designed for low-power portable equipment and digital applications requiring efficient signal routing across multiple voltage domains with minimal signal degradation.

Replacement Considerations

Check for SN74CB3T16212DGGR or SN74CB3T16212DGVR if alternative packages are required. Verify pinout and functional equivalence before substituting with other bus switch ICs.

FAQ

How does the device handle partial-power-down scenarios?

The device includes an Ioff feature that ensures no damaging backflow current occurs through the I/O ports when the device is powered down.

What controls the data path in the bus-exchange switch?

The select inputs S0, S1, and S2 control the data path, determining which A port connects to which B port or if the ports are disconnected.